Pinger sent us word that their Textfree [$5.99 - iTunes link] for iPhone and iPod touch, which lets US users send and reply to SMS, has hit 1 billion messages delivered in just 10 months.

Now, we don't usually run metrics announcements here at TiPb, but I don't usually come back from CES with $45 in SMS charges either (billed at $0.80 each since I was roaming). Would that they would internationalize it!

If you've used Textfree or another SMS-alternative, how did it work for you?